Glossary term
What is Trace ID / Correlation ID? Meaning for developers
An ID shared across all logs and spans of one request. Example: Search logs by trace_id to follow one checkout.
Learn it properly · System DesignLesson 46: Logs, Metrics & Traces: The Three Pillars“Checkout took 20 seconds and failed” — but checkout touches eleven components. How logs, metrics and traces each answer a different question, how to instrument with OpenTelemetry, and how linking them takes you from “something's wrong” to “here's why” in minutes.